JP2018129946A - Manufacturing method of stator core, axial gap motor, stator core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of stator core effectively.SOLUTION: A stator core 30 is constituted of multiple core sheets 60. Each core sheet 60 has a long portion 62, and multiple protrusions 64 arranged in the longitudinal direction of the long portion 62, and protruding to one side in the lateral width direction thereof. The multiple core sheets 60 are bent annularly. When multiple long portions 62 are laminated, annulus 42 of the stator core 30 is constituted, and when the multiple protrusions 64 formed on the multiple core sheets 60 are laminated, multiple teeth 44 in the stator core 30 are constituted.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a stator core applied to an axial gap type motor, an axial gap type motor, and a method for manufacturing a stator core.

  Since the magnetic flux flows in the circumferential direction in the stator core of the axial gap type motor, the magnetic flux resistance increases in a general stator core in which core sheets are laminated in the axial direction. For this reason, a powder core having no magnetic flux direction may be used. However, the powder core is expensive in material and processing.

  Therefore, a stator core has been proposed in which only a disk-shaped annular portion of the stator core is formed of a powder core, and a plurality of core sheets are laminated in the radial direction of the stator core (for example, Patent Documents). 1).

JP 2011-193564 A

  However, in the above-described stator core, since the low-cost laminated core is only applied to the teeth portion, the cost improvement effect is low.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a stator core, an axial gap type motor, and a method for manufacturing a stator core that can effectively reduce the cost.

  In order to achieve the object, the stator core according to claim 1 has a long portion and a plurality of convex portions that are arranged in the longitudinal direction of the long portion and project to one side in the lateral width direction of the long portion. An annular portion configured by a plurality of core sheets, each of the plurality of core sheets being annularly bent and a plurality of the elongated portions being stacked, and the plurality of convex portions formed on the plurality of core sheets And a plurality of teeth portions configured by laminating.

  According to this stator core, the annular portion and the plurality of teeth portions of the stator core are configured by a plurality of core sheets. Therefore, for example, the number of parts can be reduced as compared with a stator core that separately includes an annular portion and a plurality of teeth portions in which a plurality of core sheets are laminated. In addition, by bending a plurality of core sheets in an annular shape and laminating a plurality of long portions, by laminating a plurality of convex portions, a stator core having an annular portion and a plurality of teeth portions can be formed. The manufacturing process can also be reduced. Thereby, cost can be reduced effectively.

  A stator core according to a second aspect is the stator core according to the first aspect, wherein the long portions of the plurality of core sheets are each bent into a polygonal shape.

  According to this stator core, the long portions of the plurality of core sheets are each bent into a polygonal shape. Therefore, when laminating a plurality of long portions, the plurality of long portions can be easily positioned by aligning polygonal corners of the plurality of long portions. Thereby, the workability | operativity at the time of laminating | stacking a several core sheet | seat and assembling a stator core can be improved.

  According to a third aspect of the present invention, in the stator core according to the second aspect, the convex portion is positioned on a side portion between the polygonal corner portions of the long portion.

  According to this stator core, the convex portions are located on the side portions between the polygonal corner portions of the long portion. Therefore, since the convex part which comprises a teeth part does not have a crease | fold, a several convex part can be made into planar shape. Thereby, since a some convex part can be laminated | stacked easily, the workability | operativity at the time of laminating | stacking a several core sheet and assembling a stator core can be improved further. Moreover, since each teeth part can be comprised in the state which contact | adhered the some convex part by making several convex parts planar, the magnetic loss in each teeth part can be suppressed.

  The stator core according to claim 4 is the stator core according to any one of claims 1 to 3, wherein a plurality of the long portions have a length of the annular portion of the plurality of long portions. It is set as the structure which becomes long in order from the elongate part located in a radial direction inner side to the elongate part located in an outer side.

  According to this stator core, the length of the plurality of long portions becomes longer in order from the long portion positioned on the radially inner side of the annular portion to the long portion positioned on the outer side of the plurality of long portions. Therefore, since the width of the seam of the long part of the second and subsequent layers from the inside of the annular part can be suppressed and the seam can be narrowed, the magnetic loss in the annular part constituted by a plurality of long parts can be reduced. Can be suppressed.

  A stator core according to a fifth aspect is the stator core according to any one of the second to fourth aspects, wherein the joints of the plurality of long portions are shifted in the circumferential direction of the annular portion. Yes.

  According to this stator core, the seams of the plurality of long portions are shifted in the circumferential direction of the annular portion. Therefore, since it can suppress that the seam of a some elongate part concentrates on one place in the circumferential direction of an annular part, the magnetic loss in an annular part can be suppressed.

  An axial gap type motor according to a sixth aspect includes the stator core according to any one of the first to fifth aspects, and a plurality of winding portions wound around each of the plurality of tooth portions. A stator, and a rotor having a rotor magnet facing the teeth portions in the axial direction of the stator and rotating with respect to the stator.

  According to this axial gap type motor, since the stator core according to any one of claims 1 to 5 is provided, the cost can be effectively reduced.

  The method for manufacturing a stator core according to claim 7 includes: a plurality of core sheets having a long portion and a plurality of convex portions arranged in a longitudinal direction of the long portion and projecting to one side in a width direction of the long portion. A core sheet forming step to be formed; a bending step of bending the plurality of core sheets in an annular shape; and forming the annular portion by laminating the long portions of the plurality of core sheets bent in an annular shape, A plurality of protrusions formed on the core sheet to form a plurality of teeth, and an assembly step of assembling a stator core having the annular portion and the plurality of teeth.

  According to this stator core manufacturing method, the annular portion and the plurality of teeth portions of the stator core are configured by a plurality of core sheets. Therefore, for example, the number of parts can be reduced as compared with a stator core that separately includes an annular portion and a plurality of teeth portions in which a plurality of core sheets are laminated. In addition, by bending a plurality of core sheets in an annular shape and laminating a plurality of long portions, by laminating a plurality of convex portions, a stator core having an annular portion and a plurality of teeth portions can be formed. The manufacturing process can also be reduced. Thereby, cost can be reduced effectively.

1 is a longitudinal sectional view of an axial gap type motor according to an embodiment of the present invention. It is the perspective view which looked at the stator core assembly comprised by the stator core of the stator shown by FIG. 1, an inner ring, and the outer ring from the axial direction one side. FIG. 3 is a perspective view of the stator core assembly shown in FIG. 2 viewed from the other side in the axial direction. FIG. 3 is a two-side view (a plan view and a side portion) of the stator core assembly shown in FIG. 2. FIG. 3 is a bottom view of the stator core assembly shown in FIG. 2. It is a perspective view of the stator core single body shown by FIG. FIG. 7 is a plan view of the stator core shown in FIG. 6. It is a figure which shows the unfolded state before bending the some core sheet which comprises the stator core shown by FIG. It is a figure which shows the bending process which bends the core sheet shown by FIG. 8 cyclically | annularly. It is a figure which shows the assembly process which laminates | stacks the several core sheet | seat bent by the ring shape shown by FIG. 9, and assembles a stator core. It is a two-view figure (plan view and side part) which shows the 1st modification of the stator core concerning one embodiment of the present invention. It is a two-view figure (plan view and side part) which shows the 2nd modification of the stator core which concerns on one Embodiment of this invention.

  First, the overall configuration of an axial gap motor to which a stator core according to an embodiment of the present invention is applied will be described.

  As shown in FIG. 1, the axial gap motor 10 according to an embodiment of the present invention includes a motor case 12, a stator 14, and a rotor 16.

  The motor case 12 includes a first motor case 18 and a second motor case 20. The first motor case 18 and the second motor case 20 are divided in the axial direction of the axial gap type motor 10. The first motor case 18 is formed in a disc shape, and the second motor case 20 is formed in a concave shape forming a circle in a plan view along the axial direction of the axial gap motor 10.

  A concave first bearing housing portion 22 is formed in the central portion of the first motor case 18, and a concave second bearing housing portion 24 is also formed in the central portion of the second motor case 20. The outer rings of the first bearing 26 and the second bearing 28 which are ball bearings are press-fitted inside the first bearing housing portion 22 and the second bearing housing portion 24, respectively.

  The stator 14 includes a stator core 30, an inner ring 32, an outer ring 34, an insulator 36, and a plurality of winding portions 38. The stator core 30 is formed in an annular shape. The stator core 30 has an annular portion 42 and a plurality of teeth portions 44 arranged in the circumferential direction of the annular portion 42 (see also FIG. 2).

  The stator core 30, the inner ring 32, and the outer ring 34 constitute a stator core assembly 46. The configuration of the stator core assembly 46 will be described in detail later. The insulator 36 is attached to the stator core 30, and the plurality of winding portions 38 are wound around each of the plurality of tooth portions 44 via the insulator 36.

  The rotor 16 includes a rotor body 48, a rotor magnet 50, and a shaft 52. The rotor body 48 is formed in a disc shape and is arranged coaxially with the stator 14. The rotor magnet 50 is provided in an annular shape, and is disposed to face the plurality of tooth portions 44 in the axial direction of the stator 14.

  A through hole 54 penetrating in the axial direction of the rotor main body 48 is formed in the central portion of the rotor main body 48, and a substantially central portion of the shaft 52 is press-fitted into the through hole 54. Both ends of the shaft 52 are press-fitted inside the inner rings of the first bearing 26 and the second bearing 28 described above, and the rotor 16 can rotate to the motor case 12 via the first bearing 26 and the second bearing 28. It is supported.

  In this axial gap type motor 10, when a current sequentially flows through the plurality of winding portions 38, a rotating magnetic field is formed in the stator 14, and attraction and repulsive force act on each magnetic pole of the rotor magnet 50 by this rotating magnetic field. The rotor 16 rotates relative to the stator 14.

  Next, the configuration of the above-described stator core assembly 46 will be described more specifically.

  As shown in FIGS. 2 to 5, in the stator core assembly 46, the stator core 30 is disposed between the inner ring 32 and the outer ring 34. A material for forming the inner ring 32 and the outer ring 34 can be selected as appropriate, for example, resin or metal.

  As described above, the stator core 30 includes the annular portion 42 and the plurality of teeth portions 44. The plurality of teeth portions 44 are arranged in the circumferential direction of the annular portion 42. As indicated by an arrow A, the plurality of teeth portions 44 are formed in a column shape that protrudes to one side in the axial direction of the annular portion 42. Each tooth portion 44 is formed in an isosceles trapezoidal shape with a center line extending in the radial direction of the stator core 30 in a plan view viewed from one axial direction side of the stator core 30.

  The annular portion 42 has a polygonal shape having the same corners as the number of the plurality of tooth portions 44. In the present embodiment, the number of the plurality of tooth portions 44 is, for example, 12 pieces, and the annular portion 42 has a polygonal shape having 12 corner portions. That is, the inner peripheral surface and the outer peripheral surface of the annular portion 42 are each a regular dodecagon.

  The inner peripheral surface of the inner ring 32 is formed in a circular shape, but the outer peripheral surface of the inner ring 32 is formed in a polygonal shape. On the other hand, the outer peripheral surface of the outer ring 34 is formed in a circular shape, but the inner peripheral surface of the outer ring 34 is formed in a polygonal shape. The polygons of the outer peripheral surface of the inner ring 32 and the outer peripheral surface of the outer ring 34 are polygons corresponding to the number of the plurality of tooth portions 44, similarly to the inner peripheral surface and the outer peripheral surface of the annular portion 42. In this embodiment, it is a regular dodecagon.

  The inner ring 32 is press-fitted inside the stator core 30, and the stator core 30 is press-fitted inside the outer ring 34. That is, the outer peripheral surface of the inner ring 32 is fitted to the inner peripheral surface of the stator core 30, and the inner peripheral surface of the outer ring 34 is fitted to the outer peripheral surface of the stator core 30.

  As shown in FIGS. 6 and 7, the stator core 30 described above is more specifically configured by a plurality of core sheets 60. The plurality of core sheets 60 are formed of steel plates.

  As shown in FIG. 8, each of the plurality of core sheets 60 is formed in a comb shape having a long portion 62 and a plurality of convex portions 64. Each core sheet 60 shown in FIG. 8 is shown in an unfolded state before being bent into an annular shape. In each core sheet 60, the plurality of convex portions 64 are arranged in the longitudinal direction of the long portion 62. As shown by the arrow A, the plurality of convex portions 64 protrude to one side of the long portion 62 in the lateral width direction. 8 corresponds to one side in the axial direction of the annular portion 42 indicated by the arrow A direction in FIGS. 2 to 5.

  In FIG. 8, the core sheet 60 with the long portion 62 having the length L1 is positioned at the innermost portion of the stator core 30 (see FIG. 6), and the long portion 62 has the length Ln. Reference numeral 60 denotes an outermost part of the stator core 30. The number of the plurality of core sheets 60 can be arbitrarily set. The length of the plurality of long portions 62 is such that the long portion 62 positioned on the outer side from the long portion 62 positioned on the radially inner side of the annular portion 42 (see FIGS. 6 and 7). It becomes long in order. That is, in the example of FIG. 8, the length of the long part 62 becomes longer in order from L1 to Ln.

  As shown in FIGS. 6 and 7, the plurality of core sheets 60 are bent in an annular shape. In the plurality of core sheets 60, specifically, the plurality of long portions 62 are bent into polygonal shapes, respectively, so that the plurality of core sheets 60 have an annular shape. The plurality of long portions 62 are each bent into a polygonal shape corresponding to the number of the plurality of teeth portions 44. In the present embodiment, the polygonal shape of the plurality of long portions 62 is a regular dodecagon.

  The plurality of long portions 62 bent into a polygonal shape are stacked in close contact with each other in the radial direction of the plurality of long portions 62. And the above-mentioned cyclic | annular part 42 is comprised by laminating | stacking the some elongate part 62 in this way.

  Further, the plurality of convex portions 64 at the same position in the circumferential direction in the plurality of core sheets 60 bent in an annular shape are also laminated in close contact. And the above-mentioned several teeth part 44 is each comprised by laminating | stacking each several convex part 64 in the same position of the circumferential direction in the several core sheet 60 in this way.

  More specifically, each long portion 62 is bent at a position away from the convex portion 64, and the polygonal corner portion 66 in the long portion 62 is a convex adjacent to the circumferential direction of the long portion 62. It is located between the parts 64. And the convex part 64 is located in the edge part 68 between the polygonal corner | angular parts 66 in the elongate part 62. As shown in FIG.

  As shown in FIG. 7, the seam 70 of each long portion 62 is located at one corner 66 of the polygonal corners 66 in the long portion 62. The plurality of long portions 62 are assembled with each other in a state where the seams 70 of the long portions 62 are shifted in the circumferential direction of the annular portion 42. In the present embodiment, as an example, the plurality of seams 70 are shifted in the circumferential direction so as to move sequentially from the seam 70 located radially inside the annular portion 42 to the seam 70 located outside. Yes.

  In addition, in the joint 70 of each elongate part 62, the both ends of each elongate part 62 in the longitudinal direction may be contact | abutted, and may be adjoined (separated) without contact | abutting. As described above, the core sheet 60 (the long portion 62) is either in the case where both ends in the longitudinal direction of the long portions 62 are in contact with each other or in the case where they are close to each other without being in contact with each other. An annular shape (polygonal shape) is formed.

  Next, a method for manufacturing the stator core 30 according to an embodiment of the present invention will be described.

[Core sheet forming process]
First, in the core sheet forming step, a plurality of core sheets 60 are formed as shown in FIG. The plurality of core sheets 60 are formed by punching or the like, for example. The plurality of core sheets 60 are formed so as to have a long portion 62 and a plurality of convex portions 64 that are arranged in the longitudinal direction of the long portion 62 and project on one side in the lateral width direction (arrow A direction) of the long portion 62. Is done.

[Bending process]
Subsequently, in the bending process, as shown in FIG. 9, the plurality of core sheets 60 are bent in an annular shape. At this time, the plurality of long portions 62 are each bent into a polygonal shape corresponding to the number of the plurality of tooth portions 44. In the present embodiment, the polygonal shape of the plurality of long portions 62 is a regular dodecagon. In addition, the polygonal corners 66 in each of the long portions 62 are set at positions deviating from the convex portions 64, and the convex portions 64 are located on the side portions 68 between the corner portions 66 in the polygonal shape of the long portions 62. Be positioned.

  The lengths of the side portions 68 in the plurality of long portions 62 are located outside the long portions 62 that are located on the radially inner side of the annular portion 42 (see FIGS. 6 and 7) among the plurality of long portions 62. It is set so as to become longer in order to the long portion 62. Further, the joint 70 of the long portion 62 is positioned at one corner 66 in the polygonal shape of the long portion 62. In the seam 70 of the long portion 62, both ends in the longitudinal direction of the long portion 62 are brought into contact with each other or are brought close to each other without being in contact.

[Assembly process]
Next, in the assembling process, as shown in FIG. 10, the outer core sheet 60 is sequentially assembled on the outer side of the inner core sheet 60, whereby the plurality of core sheets 60 are stacked and the stator core 30 is assembled.

  At this time, a plurality of long portions 62 bent in a polygonal shape are stacked to form the annular portion 42. In addition, the plurality of convex portions 64 at the same position in the circumferential direction in the plurality of core sheets 60 bent in an annular shape are stacked to form a plurality of teeth portions 44. Then, the stator core 30 having the annular portion 42 and the plurality of teeth portions 44 is assembled.

  Next, the operation and effect of one embodiment of the present invention will be described.

  As described in detail above, according to the present embodiment, the annular portion 42 and the plurality of teeth portions 44 of the stator core 30 are configured by the plurality of core sheets 60. Therefore, for example, the number of parts can be reduced as compared with a stator core that separately includes an annular portion and a plurality of teeth portions in which a plurality of core sheets are laminated. In addition, the plurality of core sheets 60 are bent into an annular shape, the plurality of long portions 62 are stacked, and the plurality of convex portions 64 are stacked to form the stator core 30 having the annular portion 42 and the plurality of teeth portions 44. Therefore, the manufacturing process can be reduced. Thereby, cost can be reduced effectively.

  Further, the long portions 62 of the plurality of core sheets 60 are each bent into a polygonal shape. Therefore, when laminating the plurality of long portions 62, the plurality of long portions 62 can be easily positioned by aligning the polygonal corner portions 66 of the plurality of long portions 62. Thereby, the workability | operativity at the time of laminating | stacking the several core sheet 60 and assembling the stator core 30 can be improved.

  Further, as shown in FIG. 7, the convex portions 64 are located on the side portions 68 between the polygonal corner portions 66 in the long portion 62. Therefore, since the creases are not formed on the convex portions 64 constituting the teeth portion 44, the plurality of convex portions 64 can be planar. Thereby, since the some convex part 64 can be laminated | stacked easily, the workability | operativity at the time of assembling the stator core 30 by laminating | stacking the several core sheet 60 can be improved further. Moreover, since each teeth part 44 can be comprised in the state which contact | adhered the some convex part 64 because the some convex part 64 becomes planar shape, the magnetic loss in each teeth part 44 is suppressed. it can.

  Further, as shown in FIG. 8, the length of the plurality of long portions 62 is the long length of the plurality of long portions 62 positioned on the outer side from the long portion 62 positioned on the radially inner side of the annular portion 42. It becomes long in order to the part 62. FIG. Therefore, since the width of the joint 70 of the second and subsequent long portions 62 from the inner side of the annular portion 42 can be suppressed and the joint 70 can be narrowed, the annular portion constituted by the plurality of long portions 62 can be formed. Magnetic loss in the portion 42 can be suppressed.

  Further, as shown in FIG. 7, the seams 70 of the plurality of long portions 62 are shifted in the circumferential direction of the annular portion 42. Therefore, since the joints 70 of the plurality of long portions 62 can be suppressed from being concentrated at one place in the circumferential direction of the annular portion 42, magnetic loss in the annular portion 42 can be suppressed.

  As shown in FIGS. 2 to 5, the inner ring 32 is disposed inside the annular portion 42, and the outer ring 34 is disposed outside the annular portion 42. The outer peripheral surface of the inner ring 32 is fitted to the inner peripheral surface of the stator core 30, and the inner peripheral surface of the outer ring 34 is fitted to the outer peripheral surface of the stator core 30. Thereby, since the several core sheet 60 bent in cyclic | annular form can be restrained, the expansion of this several core sheet 60 can be suppressed. The inner ring 32 is press-fitted inside the stator core 30, and the stator core 30 is press-fitted inside the outer ring 34, so that the bending angle of the plurality of core sheets 60 (long portions 62) constituting the stator core 30 is increased. Variations can be corrected and the shapes of the plurality of core sheets 60 can be adjusted.

  Further, as shown in FIG. 1, the axial gap type motor 10 includes the above-described stator core 30, so that the cost can be effectively reduced.

  Next, a modification of one embodiment of the present invention will be described.

(First modification)
In the above-described embodiment, each tooth portion 44 is formed in an isosceles trapezoidal shape in which the center line extends in the radial direction of the stator core 30 when viewed from one axial direction side of the stator core 30. However, as shown in FIG. 11, each tooth portion 44 has a parallelogram shape in which the center line is inclined (skewed) with respect to the radial direction of the stator core 30 when viewed from one axial direction side of the stator core 30. It may be formed.

(Second modification)
In the above embodiment, the stator core assembly 46 includes the stator core 30, the inner ring 32, and the outer ring 34. However, as shown in FIG. 12, the stator core assembly 46 may include a stator core 30 and a pair of disks 80 that sandwich the stator core 30 from both sides in the axial direction.

  In the modification shown in FIG. 12, grooves 82 extending in the radial direction of the stator core 30 are formed on both end surfaces of the tooth portion 44 in the thickness direction (same as the axial direction of the stator core 30). On the other hand, a plurality of ridges 84 extending radially are formed on the pair of disks 80, respectively. The plurality of protrusions 84 are fitted in the plurality of grooves 82, respectively. Even if comprised in this way, since the several core sheet 60 bent in cyclic | annular form can be restrained, the expansion of this several core sheet 60 can be suppressed.

(Other variations)
In the above embodiment, the number of the plurality of convex portions 64 (the plurality of teeth portions 44) is set to 12, but may be set to a number other than 12. Further, the polygonal shape of the plurality of long portions 62 may be a polygon other than a regular dodecagon, corresponding to the number of the plurality of convex portions 64 (the plurality of teeth portions 44).

  In the above-described embodiment, each of the long portions 62 is preferably bent at a position away from the convex portion 64, but may be bent at the position of the convex portion 64.

  Moreover, in the said embodiment, although the several core sheet 60 is bent cyclically so that each elongate part 62 may comprise polygonal shape, you may be bent by the annular | circular shape as a whole.

  Further, in the above-described embodiment, the plurality of seams 70 are preferably arranged in the circumferential direction so as to move to the adjacent corners 66 in order from the seam 70 located radially inside the annular portion 42 to the seam 70 located outside. They are shifted. However, the way of shifting the plurality of seams 70 may be changed with respect to the above so that the plurality of seams 70 are arranged at different corners 66. In addition, as long as all the seams 70 are not arranged at the same position in the circumferential direction in the annular portion 42, other ways of shifting the seams 70 may be used.

  In the above embodiment, the inner ring 32 and the outer ring 34 may be a laminated ring or a solid ring.

  Moreover, in the said embodiment, after fixing the outer side of the several laminated | stacked core sheet 60 with the outer ring 34, and fixing the several core sheet 60 by laser welding etc., you may remove the outer ring 34. FIG.

  In the above embodiment, the inner ring 32 may be omitted, and the plurality of core sheets 60 that are to be spread outward may be restrained only by the outer ring 34.

  Moreover, in the said embodiment, the outer side of the laminated | stacked several core sheet 60 is fixed with the outer side ring 34, and resin of a thin film is integrally formed in the surface except the upper and lower surfaces (axial direction both end surfaces) of the several core sheet 60, While securing the insulation between the winding portion 38 and the stator core 30, the plurality of core sheets 60 may be fixed with resin.

  Moreover, in the said embodiment, you may join the joint 70 of the elongate part 62 in the core sheet 60 of the outermost layer by welding in the state which clamped the some laminated | stacked core sheet 60 from the outer side. Further, after joining the joints 70 by welding in this way, the plurality of core sheets 60 may be fixed by the inner ring 32 and the outer ring 34 having escape portions that escape the welded portions of the joints 70. The plurality of core sheets 60 may be fixed by the outer ring 34 having escape portions that escape the welded portions, and the resin may be integrally formed on the plurality of core sheets 60.

  Moreover, in the said embodiment, you may attenuate the vibration of the several core sheet 60 by apply | coating an adhesive agent, an impregnating agent, etc. between the laminated | stacked several core sheets 60. FIG.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and other various modifications can be made without departing from the spirit of the present invention. It is.

DESCRIPTION OF SYMBOLS 10 ... Axial gap type motor, 12 ... Motor case, 14 ... Stator, 16 ... Rotor, 18 ... First motor case, 20 ... Second motor case, 22 ... First bearing housing part, 24 ... Second bearing housing part, 26 ... 1st bearing, 28 ... 2nd bearing, 30 ... Stator core, 32 ... Inner ring, 34 ... Outer ring, 36 ... Insulator, 38 ... Winding part, 42 ... Ring part, 44 ... Teeth part, 46 ... Stator core set Solid body, 48 ... rotor body, 50 ... rotor magnet, 52 ... shaft, 54 ... through hole, 60 ... core sheet, 62 ... long part, 64 ... convex part, 66 ... corner part, 68 ... side part, 70 ... seam 80 ... disc, 82 ... groove, 84 ... ridge

Claims (7)

It is constituted by a plurality of core sheets having a long portion and a plurality of convex portions that are arranged in the longitudinal direction of the long portion and project to one side in the width direction of the long portion,
An annular portion formed by laminating the plurality of long portions, each of the plurality of core sheets being annularly bent;
A plurality of teeth formed by laminating the plurality of convex portions formed on the plurality of core sheets; and
A stator core comprising: The long portions of the plurality of core sheets are each bent into a polygonal shape,
The stator core according to claim 1. The convex part is located on a side part between corners of the polygonal shape in the long part,
The stator core according to claim 2. The length of the plurality of long portions becomes longer in order from the long portion located on the radially inner side of the annular portion to the long portion located on the outside of the plurality of long portions.
The stator core according to any one of claims 1 to 3. The seams of the plurality of long portions are displaced in the circumferential direction of the annular portion,
The stator core according to any one of claims 2 to 4. A stator having the stator core according to any one of claims 1 to 5 and a plurality of winding portions wound around each of the plurality of tooth portions,
A rotor having a rotor magnet facing the teeth portions in the axial direction of the stator, and rotating with respect to the stator;
Axial gap type motor with A core sheet forming step of forming a plurality of core sheets having a long portion and a plurality of convex portions that are arranged in the longitudinal direction of the long portion and project to one side in the width direction of the long portion;
A bending step of bending the plurality of core sheets into an annular shape;
The long portions of the plurality of core sheets bent in an annular shape are stacked to form an annular portion, and the plurality of convex portions formed on the plurality of core sheets are stacked to form a plurality of teeth portions. And an assembly step of assembling a stator core having the annular portion and the plurality of teeth portions,
A method for manufacturing a stator core comprising: